Hi,
I use a HTC One. I recently updated it to 4.4.2 with Venom 5.0
But since then it shows ''GSM'' symbol in the Notification bar instead of the ''H''.

Now i'm not knowing if the data is being used or not. My drinks a lot of Data.
So how do i get rid of that ''GSM'' symbol and get back ''H'' on the top???

Help Pleaseee..!!!

The "H" simply indicates you are in an HSDPA zone, which is faster than 3g. The "gsm" was probably just the carrier changed in the update. Shouldn't affect data usage at all. If you want to be sure though, simply disable mobile data from the settings menu, or download a "mobile data toggle" from the play store. Be sure to read though as many of them require root access.

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